On 3/18/10, EE was working on the plant with a skid steer. He had parked and climbed out using 3 points of contact. He put his foot on the tire (that was wet from a puddle) and slipped. He caught himself with his left arm and twisted his right knee. Reported event on 3/19/10 @ 2 pm. Did not seek medical attention until 4/1/10.